Sdh3000s Mtd

2000 NEC Corporation MTD-SY-013120703

3000 SERIES4 - 11 GHz STM-1/OC-3MICROWAVE RADIO SYSTEM(64/128 QAM)

1+0 SYSTEM1+1 TWIN PATH SYSTEM1+1 HOT STANDBY SYSTEMN+1 SYSTEM

This document describes the current version of NEC standard equipment. Ifthere is any conflict between this document and the System Descriptionand/or the Compliance statement, the latter will supersede this document.

The specifications or configuration contained in this document are subject tochange without notice due to NEC's continuing design improvement.

NEC Corporation

MTD-SY-013/120703 3000 SERIES 4-11GHz STM-1/OC-3 MICROWAVE RADIO SYSTEM

- i -

TABLE OF CONTENTS

LIST OF ABBREVIATIONS……………………………………….……...…………...…….iii

1. GENERAL ...................................................................................................................... ..1

2. FEATURES.......................................................................................................................6

2.1 Conformity with the latest Standards...............................................................................6

2.2 Advanced Technologies..................................................................................................6

2.3 Mounting in standard ETSI Racks...................................................................................6

2.4 Various System Applications and Easy Expandability .....................................................6

2.5 Superior Low Noise Figure..............................................................................................6

2.6 Superior Automatic Transmit Power Control ...................................................................7

2.7 Superior In-Phase (IP) and Minimum Dispersion (MID) combining Space DiversitySystem............................................................................................................................7

2.8 Electrical Differential Absolute Delay Equalization (DADE) for Space Diversity System..7

2.9 Contiguous Type branching Circuit .................................................................................7

2.10 Waveguide or Coaxial RF Interface ................................................................................7

2.11 Superior Error Performance with MLCM plus R-S ...........................................................8

2.12 Superior Adaptive Equalizers ..........................................................................................8

2.13 Various Synchronization Clock........................................................................................8

2.14 Synchronization Status Message (SSM) .........................................................................9

2.15 Abundant SOH Termination of Line Section....................................................................9

2.16 Various STM-1 Interfaces ...............................................................................................9

2.17 Multiplex Section Protection (MSP) .................................................................................9

2.18 Bi-polar Switching ...........................................................................................................9

2.19 Abundant Digital Service Channels and Wayside Traffics...............................................9

2.20 Alarm, Status and Performance Monitoring................................................................... 10

2.21 Orderwire Telephone Channels..................................................................................... 10

2.22 TMN Standard Compliant.............................................................................................. 10

2.23 Single Design Concept.................................................................................................. 10

3. SYSTEM ARCHITECTURE ............................................................................................ 12

4. OPERATIONAL DESCRIPTION..................................................................................... 15

4.1 Transmitter-Receiver (TRX) .......................................................................................... 15

4.2 Modulator-Demodulator................................................................................................. 174.2.1 Modulator-Demodulator (MODEM) Module........................................................................ 174.2.2 WS INTFC Module (Optional) ............................................................................................. 174.2.3 OH INTFC Module............................................................................................................... 17

3000 SERIES 4-11GHz STM-1/OC-3 MICROWAVE RADIO SYSTEM MTD-SY-013/120703

- ii -

4.2.4 OH EXT Module (Optional) ................................................................................................. 174.2.5 N+1 Protection Switchover Control ..................................................................................... 184.2.6 Interface Section of Modulator-Demodulator....................................................................... 18

4.3 Operation, Administration, Maintenance and Provisioning ............................................ 21

5. OPTIONS........................................................................................................................ 23

6. PERFORMANCE AND CHARACTERISTICS ................................................................. 25

6.1 64 QAM Systems .......................................................................................................... 25

6.2 128 QAM Systems ........................................................................................................ 26

6.3 1+1 Hot Standby Systems............................................................................................. 27

6.4 ATPC ............................................................................................................................ 28

6.5 MDP Equipment ............................................................................................................ 28

6.6 OAM&P......................................................................................................................... 28

6.7 Interfaces ...................................................................................................................... 28

6.8 Common ....................................................................................................................... 32

7. SUPERVISION ITEMS.................................................................................................... 33

7.1 Alarm Events* ...............................................................................................................33

7.2 Status Events* ..............................................................................................................34

7.3 Remote Monitoring Items (displayed by the LCT)* ........................................................ 34

7.4 Local Metering Items (measured by test equipment)..................................................... 34


- iii -

LIST OF ABBREVIATIONS

AC Alternating Current

ACL Alarm Control Logic

ADP Adaptive

AGC Automatic Gain Control

AIS Alarm Indication Signal

ALC Automatic Level Control

ALM Alarm

ALS Automatic Laser Shutdown

AMP Amplifier

APC Automatic Phase Control

ATPC Automatic Transmit Power Control

AU Administrative Unit

BB Base Band

BER Bit Error Rate

BPF Band Pass Filter

BR Branching

CENELEC European Committee forElectrotechnical Standardization

CH Channel

CISPR International Special Committeeon Radio Interference

CKT Circuit

CMI Coded Mark Inversion

CMOS Complementary Metal OxideSemiconductor

C/N CMI to NRZ

COMB Combiner

CONV Converter

CPU Central Processing Unit

CTRL Control

DADE Differential Absolute DelayEqualization

DC Direct Current

DCCm Data Communication Channel inMSOH

DCCr Data Communication Channel inRSOH

DECOD Decoder

DFE Decision Feedback Equalizer

DEM Demodulator

D/I Drop Insert

DI REP Drop and Insert Repeater

DIST Distributor

DP Differential Phase

DPU Digital Processing Unit

DSC Digital Service Channel

DTMF Dual Tone Multifrequency

ECC Embedded Control Channel

EEPROM Electrically ErasableProgrammable Read-OnlyMemory

EMC Electromagnetic Compatibility

ENC Encoder

E/O Electrical-to-Optical

EPS Endless Phase Shifter

EQL Equalizer

ESD Electro-Static Discharge

ETS European TelecommunicationsStandard

ETSI European TelecommunicationsStandards Institute

FD Frequency Diversity

FERF Far-End Receive Failure

FEC Forward Error Correction

FET Field Effect Transistor

HDB High Density Bipolar

HEMT High Electron Mobility Transistor

HIC Hybrid Integrated Circuit

HS Hot Standby

HYB Hybrid

IDB Interface Distribution Board

IEC International ElectrotechnicalCommittee

IF Intermediate Frequency


- iv -

INS Insertion

INTFC Interface

ITU International TelecommunicationsUnion

ITU-R Radio communication Sector ofITU (formerly CCIR)

ITU-T TelecommunicationStandardization Sector of ITU(formerly CCITT)

LAN Local Area Network

LCT Local Craft Terminal

LED

LMS

Light Emitting Diode

Local Management Service

LO Local Oscillator

LOF Loss Of Frame

LOG Logic

LOP Loss Of Pointer

LOS Loss Of Signal

LSI Large Scale Integrated Circuit

MAINT Maintenance

MDP Modulator/DemodulatorEquipment

MIC Microwave Integrated Circuit

MID Minimum In-band Dispersion

MIX Mixer

MLCM Multi-Level Coding Modulation

MLM Multi-Longitudinal Mode

MOD Modulator

MON Monitor

MS Multiplex Section

MSOH Multiplex Section Overhead

MSP Multiplex Section Protection

MST Multiplex Section Termination

N/C NRZ to CMI

NE SDH Network Element

NFB Non-Fuse Breakers

NMS Network Management System

NORM Normal (no alarms)

NRZ Non-Return to Zero

OAM&P Operation, Administration,Maintenance and Provisioning

OC-3

O/E

Optical Carrier level-3

Optical-to-Electrical

OHA Overhead Access

OIRT International Radio and TelevisionOrganization

OPT Optical

OSC Oscillator

OW

P

Orderwire

Protection Channel

PACS Protection Access Signal

PC Personal Computer

PCM Pulse Code Modulation

PD Phase Difference Detector

PDH Plesiochronous Digital Hierarchy

PMON Performance Monitoring

Pout Transmitter output power

ppm Parts Per Millions

P/Q In-Phase/Quadrature

PROC Processor

PROT Protection

PS Power Supply

QAM

RC

Quadrature Amplitude Modulation

Regular Channel

RCVD Received

REG Regular

RF Radio Frequency

RFCOH

RMCI

Radio Frame ComplementaryOverhead

Radio Message CommunicationInterface

RS

RSOH

Reed Solomon

Regenerator Section Overhead

RST Regenerator Section Termination

RX Receiver

SD Space Diversity

SDH Synchronous Digital Hierarchy

SOH

SSM

Section Overhead

Synchronization Status Message

STM Synchronous Transport Module

SV Supervision


- v -

SW Switch

SWCL Switchover Control Logic

SWO

SYNTH

Switchover

Synthesizer

TCN Threshold Crossing Notification

TDAE Time Domain Adoptive Equalizer

TRP Transmitter/Receiver Equipment

TRSV Transversal

TTL Transistor-Transistor Logic

TX Transmitter

VC Virtual Container

WS Wayside

XPIC Cross-Polarization InterferenceCanceler


- 1 -

1. GENERAL

The 3000 Series Synchronous Digital Hierarchy (SDH) long-haul microwave radio systemsare designed for the transmission of synchronous transport module level 1 (STM-1) or opticalcarrier level-3 (OC-3).

They operate in frequency bands from 4 to 11 GHz using 64 or 128 Quadrature AmplitudeModulation (QAM) as shown in Table 1, System Menu and have a transmission capacity ofSTM-1 or OC-3 per radio frequency (RF) channel.

Besides the long-haul systems, NEC offers a product line of STM-1/OC-3 radio systems thatincludes the 18/23/26 GHz 155MB (32 QAM) systems for short haul links. For those systems,please refer to the technical description MTD-PL-026.

The 4 to 11 GHz SDH radio systems can be accommodated using vacant RF channels in theexisting Plesiochronous Digital Hierarchy (PDH) radio systems without modifying the existingPDH systems.

The 4 to 11 GHz SDH radio systems are fully SDH compatible Network Elements (NE's). Thesystems are comprised, apart from aerial equipment, of the following (see Figure 1 andFigure 2):

• Transmitter/Receiver (TRP)

• Modulator/Demodulator (MDP) including radio protection switching

Operation, Administration, Maintenance and Provisioning (OAM&P) functions are built into theMDP. The orderwire telephone circuit is also included in the MDP.


- 2 -

Figure 1. External View


- 3 -

Figure 2. Equipment Configuration for a 3+1 Terminal

%5#&.7#2#'83#&.7+#7;#2#5;#2#6'#5;#,

(4/#%2$5'

3,2#,17)&

,17(5)$&(+,'%,

237,21#5$&.

'05#0#6333

1)%#%2$5'

753

+7;,+5;,

+6'#5;,

3

753

+7;,+5;,

+6'#5;,

54

753

+7;,+5;,

+6'#5;,

55

753

+7;,+5;,

+6'#5;,

56

,5&+2$0)3

22:,

0'3+,17),

3

0'3+,17),

54

0'3+,17),

55

0'3+,17),

56

0'3

+'&0'&,+:6,

3254

0'3

+0'2;3,&2&/.,

3#54#55#56

0'3

+'&0'&,+:6,

55256

933PP

5533

PP

'HSWK#=#633PP


- 4 -

Figure 3. N+1 FD/SD Terminal Station Simplified System Block Diagram


- 5 -

Table 1. System Menu

✔ : Available

L4GHz U4GHz 5GHz L6GHz U6GHz 7.5GHz 8GHz 11GHz

Modulation64QAM /MLCM+RS

✔✔✔✔ --- ✔✔✔✔ --- ✔✔✔✔ --- ✔✔✔✔ ✔✔✔✔

Scheme 128QAM /MLCM

--- ✔✔✔✔ --- ✔✔✔✔ --- ✔✔✔✔ ✔✔✔✔ ---

FD ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔

Diversity FD/SD ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔

HS/HS ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔

HS/SD ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔

TX Power *1)+33dBm ✔✔✔✔ --- ✔✔✔✔ --- ✔✔✔✔ --- ✔✔✔✔ ---

+30dBm ✔✔✔✔ --- ✔✔✔✔ --- ✔✔✔✔ --- ✔✔✔✔ ✔✔✔✔

+32dBm --- ✔✔✔✔ --- ✔✔✔✔ --- ✔✔✔✔ ✔✔✔✔ ---

+29dBm --- ✔✔✔✔ --- ✔✔✔✔ --- ✔✔✔✔ ✔✔✔✔ ---

ATPC ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔

XPIC ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ --- ✔✔✔✔ ✔✔✔✔

Branching Circulator ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔

Circuit Contiguous *2) ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ ✔✔✔✔ --- --- ---

Common Baseband Interface : STM-1 Optical , STM-1 Electrical and OC3

DC Power Input : -24V (-20V to -35V) , -48V (-36V to -72V) or +24V (+20V to +35V)

Wayside Transmission : 2 x 2MB or 2 x 1.5MB for 64QAM, 1 x 2MB or 2 x 1.5MB for 128 QAM

Note : *1) : Nominal value without ATPC operation. Maximum value with ATPC operation is 2dB higher than above. *2) : Contiguous branching circuit will be available only for XPIC system.


- 6 -

2. FEATURES

2.1 Conformity with the latest Standards

All NEC NE's are fully SDH compatible and conform to the relevant ITU-R and ITU-TRecommendations and European Telecommunications Standards (ETS).

2.2 Advanced Technologies

Throughout the SDH radio system, NEC's own advanced technologies are used. Intensiveuse of Microwave Integrated Circuits (MIC's) and Hybrid IC's (HIC's) makes the TRP durableand compact. In addition, custom-made large-scale integrated circuits (LSI's) are applied. Forexample, the new digital MODEM is incorporated into a single LSI chip developed by NECspecifically for radio equipment. Furthermore, low-power high-speed complementary metaloxide semiconductors (CMOS) LSI’s are extensively used, making the equipment morecompact and reducing the power consumption.

2.3 Mounting in standard ETSI Racks

All sub-racks in NEC's SDH Family including radio, fiber optics transmission systems andadd-drop multiplexers, are mounted in standard 2,200 mm high ETSI racks which meetprETS 300 119-3 (refer to Figure 1). The width of the electronics is 500 mm (standard),allowing 50 mm wide cable ducts at both sides of the rack. This vendor-independent solutionprovides full front access and simplifies future expansion. Standard SDH radio systems areshipped fully rack-mounted and intra-rack wired, enabling easy and quick installation. Fans tocool the equipment are not required.

2.4 Various System Applications and Easy Expandability

Various system applications such as N+1 Frequency Diversity (FD) and Hot-Standby (HS)protection switching systems are available. The system can easily be expanded by addingmodules and/or subracks to the existing configuration to add transmission capacity. Themaximum protected transmission capacity is 11+1. The N+1 protection switchover is hitless,resulting in error free switchover operation.

2.5 Superior Low Noise Figure

The very low noise figure of the receivers results in a high system gain.


- 7 -

2.6 Superior Automatic Transmit Power Control

NEC’s SDH radio equipment is equipped with Automatic Transmit Power Control (ATPC)function as standard. The ATPC function reduces interference against neighboring systems,reduces the adverse effect of “up fading” propagation, improves residual BER performance,reduces power consumption and improves equipment reliability. Furthermore, the ATPC hassignificant capability to increase TX power 2dB above the normal maximum (e.g., maximum+35 dBm for 64QAM) when bit errors are detected in deep fading condition. Accordingly,system gain improves by approximately 2dB at BER=10-3. The ATPC is also available in thesystems such as video distribution systems that employ different numbers of go and returnchannels.

2.7 Superior In-Phase (IP) and Minimum Dispersion (MID) combining Space Diversity System

In order to reduce the adverse effects of multipath fading and to increase link availability,IP+MID space diversity method is effective for long distance hops or a hop where reflectingwave exists. The IP+MID space diversity combining method provides greater improvement ofin-band dispersion.

2.8 Electrical Differential Absolute Delay Equalization (DADE) forSpace Diversity System

Standard equipped electrical DADE is effective for quick installation and easy adjustment.The DADE operates to equalize absolute delay difference between main and space diversityreceived signals.

2.9 Contiguous Type branching Circuit

The optional contiguous type branching circuit is applied for XPIC systems in order tominimize adjacent frequency separation (80MHz to 40MHz, 60MHz to 30MHz). It reduces thelosses associated with the hybrid circuits currently employed in circulator type branchingcircuit.

2.10 Waveguide or Coaxial RF Interface

Depending upon installation conditions and link performance, waveguide or coaxial cable typeRF interface can be selected. The waveguide type provides low branching circuit loss whilethe coaxial cable type facilitates easy installation.


- 8 -

2.11 Superior Error Performance with MLCM plus R-S

Multi-Level Coding Modulation (MLCM) plus Reed-Solomon (R-S) coding is used as a forwarderror correction (FEC) system to ensure a superior error performance. The merits of MLCMare:

i) Superior coding gain (approximately 2.5 dB at BER=10-3 without R-S)

ii) Low coding redundancy enabling transmission of one or two 2 Mbit/s wayside (WS) channels in the Radio Frame Complementary Overhead (RFCOH) *

iii) Low operation speed of decoder.

* Note: 64QAM System: 2 x 2 Mbit/s or 2 x 1.5 Mbit/s128QAM System: 1 x 2 Mbit/s or 2 x 1.5 Mbit/s

The merits of R-S coding are:

i) Superior coding gain (approximately 1.0dB improvement at BER=10-6)

ii) Superior block error correction

iii) Superior residual BER performance

R-S coding FEC is available only in the 64QAM system. Customer can disable the R-Scoding FEC function on site, if required.

2.12 Superior Adaptive Equalizers

NEC’s SDH radio equipment is equipped with a baseband type Time Domain AdaptiveEqualizer (TDAE). The TDAE consists of Linear equalizer as forward taps and DecisionFeedback Equalizer (DFE) as backward taps. Adoption of the latest in NEC’s own LSItechnology significantly enhances the TDAE capability to equalize waveform distortion andintersymbol interference in the time domain. Accordingly, the TDAE can equalize minimumphase fading completely.

2.13 Various Synchronization Clock

The timing of the radio system can be done using two different external sources:

a) Reference clock (2 MHz input, optional 2 or 1.5 Mbit/s)

b) Clock derived from incoming signal. If one reference source fails, the systemautomatically switches to the other source, if available. If both external sourcesfail, the system automatically switches to the internal oscillator. This is all inaccordance with ITU-T G.783. Two clock oscillators are provided for protection.


- 9 -

2.14 Synchronization Status Message (SSM)

NEC’s SDH radio equipment supports synchronization status messages (SSM) in accordancewith ITU-T Recommendation. The SSM transports reference timing information and anindication of the quality level of the source generating this timing information.

2.15 Abundant SOH Termination of Line Section

NEC's SDH radio has the standard feature of SOH termination in two directions: not only forthe radio section but also for the electrical or optical line section which is terminated at theradio station. For example, the incoming line signal quality can be monitored. This addedvalue provides real and cost-effective total manageability of the communications network andenables easier fault location between the line, multiplex and radio systems.

2.16 Various STM-1 Interfaces

The system can be equipped with an electrical or an optical STM-1 interface for eachchannel. The optical interface is available for two different cable lengths: for intra-office andlong haul inter-office applications.

2.17 Multiplex Section Protection (MSP)

This function enables the connection of a 1+1 redundancy for optical fiber cable directly to theradio equipment in accordance with ITU-T G.783 (Annex A 1:1 compatible with 1:n). Thisfunction is available as an option for various protection schemes, such as 1+1, N+1 and HSsystems.

2.18 Bi-polar Switching

This function enables 1+1 redundancy for electrical interface. This function is available as anoption to preclude traffic outage due to failure of a single, common electrical interface.

2.19 Abundant Digital Service Channels and Wayside Traffics

In addition to the STM-1/OC-3 main traffic signal, the following digital service channels(DSCs) and wayside (WS) channels are available in all radio hops. These channels aretransported in the RFCOH and can be dropped and inserted at every terminal and repeaterstations.

DSC: Four 64 kbit/s plus one 192 kbit/s, or five 64kbit/sWS: One 2Mbit/s or two 1.5Mbit/s for 128QAM system Two 2Mbit/s or two 1.5Mbit/s for 64QAM system


- 10 -

2.20 Alarm, Status and Performance Monitoring

Performance monitoring is built-in, including:

a) Performance parameters as in ITU-T G.826

b) Counting the number of protection switchover operations (for 1+1 and N+1)

c) Accumulation of the failed time for individual regular channels.

The operator can perform monitoring and control functions, by using the LCT (Local CraftTerminal), or by using a Network Management System (NMS).

Furthermore, OAM&P facilities enable monitoring and control of external equipment such ashousekeeping facilities via a parallel interface.

2.21 Orderwire Telephone Channels

Express Orderwire (OW) and Omnibus OW are available on NEC's SDH Radio, using theSOH bytes E1 and E2. These channels provide voice communications throughout the entireSDH Radio network, using selective calling facilities by means of Dual Tone Multifrequency(DTMF) signaling.

2.22 TMN Standard Compliant

Management features are designed in accordance with ITU-T Rec. M.3000 and G.784. Thisenables interconnection to TMN-based network management system (NMS) from NEC orother manufacturers by means of the Q3 interface.

2.23 Single Design Concept

NEC’s SDH family includes a wide variety of transmission systems, such as the radio, add-drop multiplexer and NMS, thus opening a full range of configurations for variousapplications. As an example, a ring closure (see Figure 4) is possible with the combination ofNEC's SMS-150V add-drop multiplexer and the 3000 Series SDH radio. Such systems have aself-healing ring function.


- 11 -

Figure 4 Ring Closure Network by applying a variety of NEC’s NEs

SM S-150V SM S-150V

SM S-150V

SDH Radio

SM S-150V

SDH Radio

SM S-150V

SM S-150V

SM S-150V SM S-150V

SM S-150V

SDH Radio

SDH Radio

SM S-150V

2/34 M bit/s

2 /34 M bit/s

2 /34 M bit/s

2 /34 M bit/s

2 /34 M bit/s

2 /34 M bit/s2 /34 M bit/s

2 /34 M bit/s

2 /34 M bit/s

2 /34 M bit/s......

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

. . . . . .

. . . . . .


- 12 -

3. SYSTEM ARCHITECTURE

The typical system architecture of a 3+1 FD/SD terminal station is shown in Figure 5 and of arepeater station in Figure 6.

An optical or electrical STM-1 signal is fed to the interface units of the Modulator-Demodulator (MDP). SOH termination process of the line side and SOH insertion process ofthe radio side are performed in the interface units.

Then, the signal is fed to the modulator section of the MODEM, which produces a 64 QAM or128 QAM modulated IF signal. For the modulation schemes and system menu, please referto Table 1. The modulated IF signal is fed to the transmitter section of the TRX whichconverts the IF signal to the RF signal.

At the opposite station, the RF signal is received by the receiver section of TRX, whichconverts the RF signal to an IF signal. The IF signal is demodulated to the digital signal anderror correction is performed by the demodulator section of the MODEM.

The demodulated baseband signal is fed to the interface units of MDP, which terminates theSOH bytes of the radio side and inserts the SOH bytes for the line side, and if applicable,provides hitless switching and electrical-optical conversion.

Furthermore, 1+1 redundancy for electrical interface by bi-polar switching and 1+1redundancy for optical interface are provided as optional functions.


- 13 -

* : Option

Figure 5. 3+1 FD/SD with Protection Access Terminal Station Block Diagram (N+1)

FETAM P

RX RF

SD RXRF *

BPF

RX IF

TX RF

ATPC

M ODEMDISTSW

150MINTFC *

W SINTFC *

TR DIST TRX

Data In *

Data Out *

FETAM P

RX RF

SD RXRF *

BPF

RX IF

TX RF

ATPC

M ODEM150MINTFC

TRX

Data In

Data Out

OH INTFC

a

a

W S In *W S Out *

FETAM P

RX RF

SD RXRF *

BPF

RX IF

TX RF

ATPC

M ODEM

TRX

FETAM P

RX RF

SD RXRF *

BPF

RX IF

TX RF

ATPC

M ODEMOPTINTFC

TRX

CTRL

a

a

OPTINTFC *

ab

Data In

Data Out

Data In

Data Out

Data In *

Data Out *

M AIN

SD *

M ODULATOR-DEM ODULATORTRANSM ITTER-RECEIVER

BRANCHINGCIRCUIT

OAM &P/OW

b

BB SWCTRL *

Circu la tortype

orContiguousm ode type *

a

TX SW

OPTINTFC

CLKCLK

150MINTFC *

a

W SINTFC *

W S In *W S Out *

150MUNITSW *

OPTINTFC *

a

Data In *

Data Out *

OH EXT *


- 14 -

* : Option

Figure 6. 3+1 FD/SD Regenerative Repeater Station Block Diagram (expandable N+1)

FETAM P

RX RF

SD RXRF *

BPF

RX IF

TX RF

ATPC

MODEM

W SINTFC *

TRX

FETAM P

RX RF

SD RXRF *

BPF

RX IF

TX RF

ATPC

MODEM

TRX

OHINTFC

FETAM P

RX RF

SD RXRF *

BPF

RX IF

TX RF

ATPC

MODEM

TRX

FETAM P

RX RF

SD RXRF *

BPF

RX IF

TX RF

ATPC

MODEM

TRX

CTRL

c

M AIN

SD *

M O DULATO R-DEM O DULATO R

TRANSM ITTER-RECEIVER

BRANCHINGCIRCUIT

OAM&P/OW

c

Circulatortype


W SINTFC *

OH EXT*

MODEM

W SINTFC *

MODEM

OHINTFC

Circulatortype


OH EXT*

W SINTFC *

MODEM

MODEM

CTRL

d

TX RFBPFFETAM P

RX IFRX RF

SD RXRF *

TX RFBPFFETAM P

RX IFRX RF

SD RXRF *

TX RFBPFFETAM P

RX IFRX RF

SD RXRF *

TX RFBPFFETAM P

RX IFRX RF

SD RXRF *

TRANSM ITTER-RECEIVER

BRANCHINGCIRCUIT

M AIN

SD *

d

TRX

TRX

TRX

TRX

ATPC

ATPC

ATPC

ATPC


- 15 -

4. OPERATIONAL DESCRIPTION

This chapter describes the operation of the transmitter-receiver, modulator-demodulator andOAM&P (Operation, Administration, Maintenance & Provisioning).

4.1 Transmitter-Receiver (TRX)

The Transmitter-Receiver consists of a TX RF, TX SYNTH, FET AMP, DC-DC CONV, INTFCBOARD, RX RF, RX SYNTH and RX IF.

TX RF

The TX RF contains an IF AMP and TX frequency converter. The IF AMP amplifies the inputIF signal. The frequency converter converts the 140 MHz IF signal into an RF signal bymixing it with the local oscillator signal generated by the TX SYNTH.

TX SYNTH

The TX SYNTH contains Automatic Phase Controlled Oscillator (APC OSC) utilizing afrequency-synthesized system that features high frequency stability and easy frequencysetting.

FET AMP

The FET AMP consists of a linearizer and internal matched FET amplifiers. The operationaloutput level is controlled with Automatic Level Control (ALC).

DC-DC CONV

The DC-DC CONV consists of a switching regulator and provides stabilized low voltageoutputs for the Transmitter-Receiver using the primary DC input.

INTFC BOARD

The INTFC BOARD has the capability of Automatic Transmit Power Control (ATPC) andcommunication to the CTRL module in the Modulator and Demodulator (MDP) section. TheINTFC BOARD generates an RF output power control signal depending on the RF receiverinput power level at the opposite station. The RF output power is varied between +2 dB and-12dB of the nominal TX power in 1-dB step.

RX RF

The RX RF consists of a pre-RF amplifier, RX frequency converter and IF amplifier. The pre-RF amplifier with high electron mobility transistor (HEMT) has an AGC function to avoid anydistortion due to overload. The RX frequency converter contains a wideband, image-canceling, balanced mixer and converts the RF signal into an IF signal.

The SD RX RF (optional, for space diversity) consists of a pre-RF amplifier, RX frequencyconverter, endless phase shifter (EPS) and IF amplifier. The pre-RF amplifier with HEMTamplifier has an AGC function to avoid distortion due to overload. The RX frequencyconverter contains a wideband, image-canceling, balanced mixer, which mixes the receivedRF signal with the signal from the EPS and produces an IF signal. The EPS automatically


- 16 -

shifts the phase of the local oscillator signal received from the RX SYNTH according to thecontrol signal from the IF COMB in the RX IF.

RX SYNTH

The RX SYNTH contains APC OSC with a frequency-synthesized system featuring highfrequency stability and easy frequency setting.

RX IF

The RX IF consists of an IF BPF, delay equalizer, an IF amplifier and IF COMB (optional, forspace diversity). The IF BPF eliminates the out-band noise in the IF signal. The delayequalizer compensates for the delay distortion caused by the waveguide feeder of aerialsystem. The IF amplifier amplifies the IF signal to the specified level with AGC operation.

The optional IF COMB is used for the space diversity system. The IF COMB comprises the IFcombiner, MID combiner and SD control. The IF combiner detects the phase differencebetween the two output IF signals from the RX RF and SD RX RF in the phase differencedetector (PD), generates digital control signal to control the EPS in the RX RF and acts as anin-phase combiner. The MID combiner detects in-band distortion of combined signal level andgenerates the control signal to the EPS. The MID combiner is selected in the normalcondition. The IF combiner is selected when S/N of combined signal is degraded.

The delay time difference between the receive signals from the main antenna and SDantenna is compensated with an electrical IF differential absolute delay equalizer (DADE).


- 17 -

4.2 Modulator-Demodulator

4.2.1 Modulator-Demodulator (MODEM) Module

The modulator-demodulator (MODEM) consists of an R-S encoder, MLC encoder, QAMmodulator, QAM demodulator, time domain adaptive equalizer (TDAE), MLC decoder, R-Sdecoder function.

The R-S encoder performs stream conversion and the data streams are Reed Solomonencoded (only for 64QAM system).

The MLC encoder performs stream conversion. The converted streams undergo digitalprocessing such as overhead bit multiplexing, scrambling and differential encoding. Thesesignal streams are MLCM encoded and drive the QAM modulator to generate the IF signalwhich has amplitude-phase points of 64 or 128 different levels for signal mapping.

The QAM demodulator coherently demodulates the 128 or 64 QAM modulated IF signal andregenerates the data signals.

The TDAE dynamically compensates for the delay and amplitude distortion of regenerateddata signals, which are caused by multipath fading. The TDAE contains a ten tap linearequalizer, a six taps DFE function, and a control signal generator for the QAM demodulator.

The MLC decoder in this position performs error correction by soft-decision Viterbi decoding,differential decoding, descrambling, demultiplexing and finally stream conversion.

The R-S decoder performs error correction by Reed Solomon decoding (only for 64QAMsystem).

4.2.2 WS INTFC Module (Optional)

The WS INTFC provides the access to the wayside channels transported in the radio framecomplementary overhead (RFCOH). The following numbers of wayside channels areavailable:

- One 2Mbit/s or two 1.5Mbit/s for 128QAM system- Two 2Mbit/s or two 1.5Mbit/s for 64QAM system

4.2.3 OH INTFC Module

The OH INTFC module provides five (5) V.11 contra-directional interfaces to access the SOH(RSOH and MSOH) bytes in the STM-1/OC-3 frame. The MSOH can not be accessed atrepeater equipment.

4.2.4 OH EXT Module (Optional)

In addition to the interface provided by the OH INTFC, the OH EXT module provides five (5)V.11 contra-directional, three (3) G.711/G.712 voice frequency and three (3) G.703 co-directional interfaces for the 64 kbit/s channels.


- 18 -

4.2.5 N+1 Protection Switchover Control

N+1 protection switching is provided by the protection switchover control circuitry consistingof the SWO PROC (Switchover Processor Unit) module and SWO EXP (SwitchoverExpansion) module.

The SWO PROC module contains the control logic for N+1 protection switching and interfacelogic circuits for the protection channel and regular channels-1 to -3 in the basic rack. Alarm,status and performance monitoring facilities are also provided in the SWO PROC module,which processes stores and interfaces this information to the OAM&P section.

The SWO EXP module contains the interface logic circuits for additional regular channels-4to -7 and -8 to -11. The SWO EXP module is mounted in the expansion rack(s).

In case of 1+1 twin path or hot-standby, protection switching is provided by a HS/SWO CTRLmodule mounted in the Modulator-Demodulator section.

4.2.6 Interface Section of Modulator-Demodulator

1) Transmit Section

The transmit section provides the following functions:

a) Optical-to-electrical signal conversion (optical interface)

b) Coded mark inversion (CMI) to non-return to zero (NRZ) code conversion (electricalinterface)

c) SOH termination

The SOH termination circuit provides the following functions. See Figure 7 for an overview ofthe SOH bytes.

- Frame synchronization

- Descrambling

- Parity error detection

- SOH bits extraction

d) Pointer processing

e) SOH insertion

The SOH insertion circuit provides the following functions:

- Scrambling

- Parity check bytes multiplexing

- SOH bits multiplexing

f) AIS detection and sending

g) RDI detection and sending


- 19 -

2) Receive Section

The receive section provides the following functions:

a) Hitless switching

b) SOH termination

c) Pointer processing

d) SOH insertion

e) AIS detection and sending

f) RDI detection and sending

g) Electrical-to-optical signal conversion (optical interface)

h) NRZ to CMI conversion (electrical interface)


- 20 -

��

��

��

��

��

��

��

��

2 3 4 5 6 7 8 9A1 A1 A2 A2 A2 0

E1 F1 RSOH

D2 D3

B2 B2 K1 K2D5 D6D8 D9 MSOH

D11 D12Z1 Z1 Z2 Z2 M1 E2

RSOH

DCCr (Regenerator Section Data Communication Channel) 192 kbit/s

MSOH

RSOH

Unsert channel to be used by operator

SV and Control between Repeaters and Terminals

Media specific bytes: Available for Radio Specific usage

Synchronization status (b5 - b8)

Used for multiplex section REI (Remote Error Indication)

Frame alignment A1: 111100110/A2: 00101000 (defined).For STM-N bytes shall be 3xN for A1 and A2 respectively: Unscrambled

Regenerator Section TraceBIP-8 (Bit Interleaved Parity 8)Bit error monitoring between Repeaters and Terminals

Orderwire accessble at both terminals and repeaters

Orderwire between Terminals

MSOH

BIP-Nx4 Multiplex section bit error monitoring

Automatic protection switching (switch between terminals)

DCCm (Multiplex Section DCC)

Reserved Not yet defined

Reserved for national usage

Reserved for international sandardization

Reserved for national usage: unscrambled

R/MSOH

Purpose ITU-R Rec. 750

J0

9 S1

Name Bytes

7 D78 D10

5 B26 D4

3 D14

11 A12 B1

Figure 7. Allocation and Usage of SOH Bytes


- 21 -

4.3 Operation, Administration, Maintenance and Provisioning

OAM&P functions available in the 3000 Series SDH Radio Systems are summarized asfollows:

(1) Network Element Facilities with display and controls

• Alarm and status management

• Performance management

(2) TMN based management functions with Qecc and Q3 interface

(3) Omnibus and Express OW Telephones

(4) N+1 Protection switchover control function (automatic/manual)

Figure 8 shows a functional block diagram. The function of each module is described below:

(i) OW module Orderwire Telephone with PCM codec and in-band DTMF circuit forselective calling facility. Two types of OW unit are available;

OW (1 CH) for omnibus orderwire channel use with a handset. (forrepeater stations)

OW (2 CH) for omnibus and express orderwire channels use with ahandset (for terminal stations).

(ii) LMS module: Alarm/Control master logic, which collects data from CTRL moduleand SWO PROC module by a serial interface. A parallel interface isalso provided to collect housekeeping alarm information. Inaddition, a serial interface is provided to collect external alarminformation and to send control signals to external facilities throughM.10 (Optional).

(iii) M.10:(optional)

A set of alarm collecting and controlling devices for alarm collectionand control from/to external equipment and/or station facilities bymeans of a parallel interface (dry contact). This module can be wall-mounted or mounted in an open rack

(iv) RMCI module: Agent which is referred to as Synchronous Equipment ManagementFunction (SEMF) and Message Communication Function (MCF) byITU-T Rec.G.782/783. Qecc interface for NMS connection overD1∼D3 bytes of SOH. Q3 interface for NMS via LAN-Ethernet (10BASE 2)

(v) LCT: Local craft terminal based on a notebook type PC with MS-Windows. The LCT provides either local or remote access to theSDH radio terminal/repeater stations and features:

• Autonomous event display of faulty conditions


- 22 -

• Current status display for alarms and performance parameterson a demand basis

• Alarm correlation function is supported.

• Control of the SDH radio system

• Provisioning or parameter setting of the SDH radio system

• Housekeeping alarm monitoring and external control for stationfacilities or existing systems

• Password protection

Figure 8. OAM&P Functional Block Diagram


- 23 -

5. OPTIONS

(1) Baseband Interface

The baseband interface can be selected from the following:

• STM-1 Electrical 150M INTFC

• STM-1/OC-3 Optical Intra-office OPT INTFC

• STM-1/OC-3 Optical Inter-office Long Haul OPT INTFC

(2) Wayside Traffic (optional)

The WS INTFC module provides an access to the 2 Mbit/s or 1.5 Mbit/s wayside channels theRFCOH. The following numbers of wayside channels are available:

- One 2Mbit/s or two 1.5Mbit/s for 128QAM system- Two 2Mbit/s or two 1.5Mbit/s for 64QAM system

(3) Service Channel Interfaces (optional)

The standard system transmits three (3) 64 kbit/s channels by using the F1, E1 and E2 bytesin the SOH. Usually E1 and E2 are accessed by the OW module to provide an OmnibusOrderwire and Express Orderwire telephone, respectively. The F1 channel can be accessedthrough a V.11 interface.

In addition, five (5) service channels are provided by the optional OH EXT module byaccessing unused bytes in the MSOH and RSOH. Apart from the access to five (5) extrabytes in the MSOH/RSOH, the OH EXT module features the following interfaces;

• Three (3) G.703 interfaces, co-directional 64 kbit/s data, providing inter-vendorconnectivity and longer intra-office cabling.

• Three (3) G.711/G.712 voice frequency interfaces, providing connectivity to conventionalsupervisory and control systems which require analog service channels, for integration ofthe SDH radio into existing networks.

(4) Protection Access (optional)

The protection access function provides low priority data transmission on the protectionchannel of N+1 configurations during normal operation of all regular channels. This isavailable for any baseband interface.


- 24 -

(5) Orderwire (optional)

An OW module is available to provide an omnibus OW channel at the repeater, and omnibusand express OW channels at the terminal.

(6) Multiplex Section Protection (optional)

The multiplex section protection (MSP) function provides a 1+1 redundancy for the opticalinterface in accordance with ITU-T G.783 (Annex A 1:1 compatible with 1:n).

(7) Bi-polar Switching (optional)

The bi-polar switching function provides a 1+1 redundancy for electrical interface by usingoptional 150M UNIT SW module. This optional provides protection against failure of electricalinterface module operating as common module (i.e., 1+0) in the standard configuration.

(8) Section Termination (selectable)

The system is software provisional as either multiplex section termination (MST) orregenerator section termination (RST). In the RST mode, the MSOH is not terminated.

(9) Power Supply (optional/selectable)

The system can be equipped with DC-DC converters selected from -48V DC, -24V and +24VDC. The range of -48V module allows for a line voltage of -60V DC power system.

(10) Space Diversity Receiver (optional)

The space diversity receiver is available to improve the path performance during an abnormalpropagation condition (i.e., deep fading).

(11) Transmitter Output Power (selectable)

Please refer to the performance and characteristics tables in Sections 6.1 and 6.2 for theavailable output power options.


- 25 -

6. PERFORMANCE AND CHARACTERISTICS

6.1 64 QAM Systems

Item 4 GHz 5 GHz U6 GHz 8 GHz 11 GHz Guaranteed

Frequency Plan

Channel Spacing

ITU-R F.635-4

40 MHz

ITU-R F.1099-2

40 MHz

ITU-R F.384-6

40 MHz

ITU-R F.386-5ANNEX 240.74 MHz

ITU-R F.387-7

40 MHz −

TX Power *1(excluding BR CKT Loss)

(5W) (dBm)(10W) (dBm)

30.033.0

30.033.0

30.033.0

30.033.0

30.0−

±1.0 dB±1.0 dB

Noise Figure (dB) 1.5 1.5 1.5 2.0 2.0 +1.0 dB

C/N vs. BER10-3 (dB) 10-6 (dB)

21.523.0

21.523.0

21.523.0

21.523.0

21.523.0

+1.0 dB+2.0 dB

RSL Overload(excluding BR CKT Loss)

10-3 (dBm) -12.0 -12.0 -12.0 -12.0 -12.0 -5 dB

RSL vs. BER(excluding BR CKT Loss)

10-3 (dBm)10-6 (dBm)

-76.1-74.6

-76.1-74.6

-76.1-74.6

-75.6-74.1

-75.6–74.1

+2.0 dB+3.0 dB

System Gain(excluding BR CKT Loss)

(5W) 10-3 (dB) *110-6 (dB)

(10W) 10-3 (dB) *110-6 (dB)

106.1104.6

109.1107.6

106.1104.6

109.1107.6

106.1104.6

109.1107.6

105.6104.1

108.6107.1

105.6104.1

--

-2.0 dB-3.0 dB

-2.0 dB-3.0 dB

R-BER 10-13 10-13 10-13 10-13 10-13 10-12

BR CKT Loss *2

1+0 (dB)1+1 (dB)1+2 (dB)1+3 (dB)1+4 (dB)1+5 (dB)

4.85.25.55.8−−

4.54.95.35.6−−

4.95.35.65.9−−

5.86.16.4−−−

5.66.16.46.99.29.6

+1.0 dB+1.0 dB+1.0 dB+1.0 dB+1.0 dB+1.0 dB

BR CKT Loss(Contiguous type)

1+3 (dB)1+7 (dB)

6.96.9

6.66.6

6.66.6

******

−−

+1.0 dB+1.0 dB

Tunable Range Half band

Waveguide Interface UDR-40 UDR-48 UDR-70 UDR-84 UDR-100

*1: Nominal value without ATPC operation. Maximum value with ATPC operation is 2 dB higher than above.

*2: Shows the values of Low Loss Cable.Loss of the BEF used to eliminate RF interference signal between Transmitter and Receiver is not included.Additional loss of the BR CKT for XPIC is not included.For BR CKT loss of the SD receiver, add 0.1dB (4 and 5GHz) or 0.2dB (U6, 8 and 11GHz).

***: Under consideration.


- 26 -

6.2 128 QAM Systems

Item 4 GHz L6 GHz 7 GHz 8 GHz Guaranteed

Frequency Plan

Channel Spacing

ITU-R F.382-7

29 MHz

ITU-R F.383-5

29.65 MHz

ITU-R F.385-6

28 MHz

ITU-R F.386-5ANNEX 129.65 MHz -


(5W) (dBm)(10W) (dBm)

29.032.0

29.032.0

29.032.0

29.032.0

±1.0 dB±1.0 dB

Noise Figure (dB) 1.5 1.5 2.0 2.0 +1.0 dB

C/N vs. BER10-3 (dB)10-6 (dB)

24.727.5

24.727.5

24.727.5

24.727.5

+1.0 dB+2.0 dB


10-3 (dBm) -12.0 -12.0 -12.0 -12.0 -5 dB


10-3 (dBm)10-6 (dBm)

-73.7-70.9

-73.7-70.9

-73.2-70.4

-73.2-70.4

+2.0 dB+3.0 dB

System Gain(excluding BR CKT Loss)(5W) 10-3 (dB) *1

10-6 (dB)

(10W) 10-3 (dB) *110-6 (dB)

102.799.9

105.7102.9

102.799.9

105.7102.9

102.299.4

105.2102.4

102.299.4

105.2102.4

-2.0 dB-3.0 dB

-2.0 dB-3.0 dB

R-BER 10-13 10-13 10-13 10-13 10-12

BR CKT Loss *2

1+0 (dB)1+1 (dB)1+2 (dB)1+3 (dB)

5.05.55.8−

4.95.35.66.0

5.86.16.5−

6.16.56.87.1

+1.0 dB+1.0 dB+1.0 dB+1.0 dB

BR CKT Loss(Contiguous Type)

1+3 (dB)1+7 (dB)

6.96.9

6.66.6

******

******

+1.0 dB+1.0 dB


Waveguide Interface UDR-40 UDR-58 UDR-70 UDR-84


*2: Loss of the BEF used to eliminate RF interference signal between Transmitter and Receiver is not included.Additional loss of the BR CKT for XPIC is not included.For BR CKT loss of the SD receiver, add 0.1dB (4GHz) or 0.2dB (L6, 7 and 8GHz).

***: Under consideration.


- 27 -

6.3 1+1 Hot Standby Systems

Item L6 GHz 11 GHz Guaranteed.

Frequency Plan

Channel Spacing

ITU-R F.385-5

29.65 MHz

ITU-R F.387-7

40 MHz -


(5W) (dBm)(10W) (dBm)

29.032.0

30.0-

±1.0 dB±1.0 dB

Noise Figure (dB) 1.5 3.0 +1.0 dB

C/N vs. BER10-3 (dB)10-6 (dB)

24.727.5

21.523.0

+1.0 dB+2.0 dB


10-3 (dBm) -12.0 -12.0 -5 dB


10-3 (dBm)10-6 (dBm)

-73.7-70.9

-75.6–74.1

+2.0 dB+3.0 dB

System Gain(excluding BR CKT Loss)(5W) 10-3 (dB) *1

10-6 (dB)

(10W) 10-3 (dB) *110-6 (dB)

102.799.9

105.9102.9

105.6104.1

--

-2.0 dB-3.0 dB

-2.0 dB-3.0 dB

R-BER 10-13 10-13 10-12

BR CKT Loss *2

TX (REG) (dB)TX (PROT) (dB)

2.82.8

3.63.6

+1.0 dB+1.0 dB

HYB 10dB coupler HYB 10 dBcoupler

RX (REG) (dB)RX (PROT) (dB)

6.46.4

3.313.6

7.67.6

4.214.4

+1.0 dB+1.0 dB


Waveguide Interface UDR-58 UDR-100


*2: Loss of the BEF used to eliminate RF interference signal between Transmitter and Receiver is not included.Additional loss of the BR CKT for XPIC is not included.


- 28 -

6.4 ATPC

(1) Dynamic Range : 12 dB to +2 dB

(2) Control Steps : 1 dB

(3) Fading Tracking Speed : 100 dB/second

(4) RSL Operating Range : -40 to -70 dBm

(5) DC Power Consumption Reduction : -40%/FET AMP

6.5 MDP Equipment

Modulation Scheme 64 QAM or 128 QAM

Demodulation System Coherent detection

IF Frequency 140 MHz

6.6 OAM&P

(1) Data Acquisition

Protocol Format : Qecc/Q3

(2) Serial Interface with LCT : RS-232C or 10BASE-T

(3) PCM Codec Characteristics for Express/Omnibus OW

Sampling Rate : 8 kHz

Encoding Law : A-law or µ-law

6.7 Interfaces

(1) Main Traffic, Electrical (STM-1)

Type (ITU-T G.703) : In station section, full functionality

Bit Rate : 155.520 Mbit/s ±20 ppm

Level : 1 Vp-p (nominal)TX accepts 12.7 dB cable loss at 78 MHz

Code Format : CMI

Impedance : 75 ohms, unbalanced (nominal)


- 29 -

(2) Main Traffic, Optical (STM-1)

TYPE (ITU-T G.957) Intra-office (I.1/S.1.1) Long haulInter-office (L.1.1)

Functionality Full

Bit Rate 155.520 Mbit/s

Code Format NRZ

Wavelength 1,310 nm

Connect (On front of panel) FC-type or SC-type

Transmitter (Data OUT)

• Source Type MLM

• Maximum Spectral Width 40 nm / 7.7 nm 4 nm

• Mean Launched Power -8 to -15 dBm 0 to -5 dBm

• Minimum Extinction Ratio 8.2 dB 10 dB

Optical Path

• Attenuation Range 0 to 7 dB / 0 to 12 dB 10 to 28 dB

Receiver (Data IN)

• Minimum Sensitivity -23 dBm / -28 dBm -34 dBm

• Minimum Overload -8 dBm -10 dBm

• Maximum Optical PathPenalty

1 dB

Safety

• Laser Product Safety IEC 825 Class 1

• Automatic Laser Shutdown ITU-T G. 958


- 30 -

(3) Digital Service Channels (Optional, on MDP, using RFCOH)

Bit Rates : 4 x 64 kbit/s plus 1 x (64 or 128) kbit/s

Input/Output Level : 2 Vp-p (nominal) Transistor-Transistor Logic (TTL)

Impedance : 110 ohms, balanced (nominal)

Interface : Contra-directional

(4) Wayside Traffic Transmission (Optional, on MDP, using RFCOH)

Bit Rate : 2 or 1 x 2.048 Mbit/s ±50 ppm

/ 2 x 1.544 Mbit/s ± 130 ppm

Input/Output Level : 2.37 Vp-p / 3.0 Vp-p /3.0 Vo-p (1.544 Mbit/s)(nominal)

Code Format : High Density Bipolar (HDB)-3/ AMI or B8ZS

Impedance (nominal) : 75 ohms, unbalanced/ 120 ohms, balanced/100 ohms, balanced (1.544Mbit/s)

(5) DCCr (D1 - D3) (on MDP)

Bit Rate : 192 kbit/s

Input/Output Level : 2 Vp-p (nominal) (TTL)


(6) DCCm (D4 - D12) (on MDP)

Bit Rate : 576 kbit/s



(7) E1, E2 (on MDP, for Omnibus & Express OW), F1 (on MDP for user channel)

Bit Rate : 64 kbit/s each




- 31 -

(8) F1 (G. 703) (on optional OH EXT in MDP)

Type : Co-directional (ITU-T G. 703)

Bit Rate : 64 kbit/s each

Level : 1 ±1.0 Vo-p

Impedance (Nominal) : 120 ohms

Code : Alternate Mark Inversion

(9) Reference Clock Input

Frequency/Bit Rate : 2.048 MHz, 2.048 or 1.544 Mbit/s

Type Unbalanced Balanced

Input Level 2 MHz

2 Mbit/s

1.5 Mbit/s

Impedance (Nominal)

0.75 to 1.5 Vo-p

2.37 ±0.237 Vo-p

-

75 ohm

1.0 to 1.9 Vo-p

3.0 ±0.3 Vo-p

3.0 ±0.15 Vo-p

120 ohm

100 ohm (1.544Mbit/s)

Code HDB3 HDB3 (1.544Mbit/s: AMI or B8ZS)

(10) Parallel Interface for Housekeeping Alarm/Control

Input (Monitoring) Items : 16 (standard) or 32 (option)

Input Interface : Photo Coupler (2-pin)

Output (Control) Items : 8

Output Interface : Dry Contact (3-pin)


- 32 -

(11) Voice Frequency Express OW and Omnibus OW Extension Facility

Circuit : 4-wire

Frequency Band : 0.3 to 3.4 kHz

Level : -6 dBm

Impedance : 600 ohms, balanced

6.8 Common

(1) Power Requirements : -48V DC (-36 to -72V DC)

-24V DC (-20 to -35V DC)

+24V DC (+20 to +35V DC)

(2) Power Consumption : Approximately 315W (for 4-U6GHz, 1+1 Terminal,10W FET type, e/w SD)

(3) Temperature Range (Excluding LCT)ETS300 019-2-3

Guaranteed Operation : -5°C to +50°C

Workable Operation : -10°C to +55°C

Transport and Storage : -30°C to +70°C

(4) Relative Humidity (Excluding LCT)

Guaranteed Operation : Less than 90% at +45°C

Workable Operation : Less than 90% at +50°C

Transport and Storage : Less than 90% at +50°C

(5) Altitude

Guaranteed Operation : Up to 4,000 m

(6) Electrostatic Discharge : 4 kV on external surface - No error (Test method: IEC (ESD) 861-2)

(7) Electro-Magnetic : In accordance with ETSI standard and CISPR Pub.22/85Compatibility (EMC) Class A, equivalent to CENELEC EN 55022 Class A.

(with front cover)


- 33 -

7. SUPERVISION ITEMS

7.1 Alarm Events*

No. Event Name Event Condition LED

1 LOSS OF SIGNAL Input signal lost í

2 LOSS OF FRAME Frame synchronization lost í

3 EXCESSIVE BER BER degraded worse than preset value (BER=10-3 to 10-5) í

4 SIGNAL DEGRADE Signal degraded worse than preset value (BER=10-5 to 10-9) -

5 LOSS OF POINTER Loss of Pointer í

6 AL INTFC ALM Communication between TR DIST module and OAM&P lost í

7 MUX SLAVE CLOCK LOSS D/I clock from MUX direction lost í

8 DMR SLAVE CLOCK LOSS D/I clock from DMR direction lost í

9 SELECTED SOURCE LOSS Clock from selected source lost í

10 EXTERNAL INPUT SIGNAL LOSS External clock input signal lost í

11 MAINTENANCE MAINT SW switch on CTRL module set to MAINT status í

12 OUTPUT LEVEL DOWN MOD IF output signal level decreases í

13 INPUT LEVEL DOWN Synchronization lost / DEM IF input signal level decrease í

14 TX LEVEL ALM TX output power down below normal í

15 TX APC ALM TX local oscillator becomes unlocked í

16 RECEIVE LEVEL ALM RX RF input level decreased í

17 RX APC ALM RX Local Oscillator unlocked í

18 MAIN RECEIVE LEV ALM Main receiver IF level decreased í

19 SD RECEIVE IN LEV ALM SD receiver IF level decreased í

20 SD CTRL ALM SD combiner function failure í

21 COMM ALM ATPC communication failure í

22 HS SW SERVICE FAILURE Hot standby system failure í

* : The alarm events are tabulated for major items only.

Rack top LED alarm

No. Item Alarm

1 PM Prompt maintenance alarm (red LED)

2 DM Deferred maintenance alarm (red LED)


- 34 -

7.2 Status Events*

No. Event Name Event Condition

1 MS-AIS RECEIVED Detection of MS-AIS, K2 byte in SOH (Alarm Indication Signal)

2 MS-RDI RECEIVED Detection of MS-RDI, K2 byte in SOH (Remote Defect Indication)

3 AIS RECEIVED Detection of AIS

* : The status events are tabulated for major items only.

7.3 Remote Monitoring Items (displayed by the LCT)*

No. Parameter Name Impairment Event

1 TX PWR Transmitter Output Power at TX OUT (dBm)

2 RX IN LEV Received Signal Level (dBm)

3 MAIN IN LEV Received Main Signal Level (dBm)

4 SD IN LEV Received SD Signal Level (dBm)

5 BBE Summary of Background Block Error

6 ES Summary of Erred Second

7 SES Summary of Severely Erred Second

* : The monitoring items are tabulated for major items only.

7.4 Local Metering Items (measured by test equipment)

No. Item Name Description

1 TX PWR Transmitter Output Power at Antenna port

2 RX IN LEV Received Signal Level

3 MAIN IN LEV Received Main Signal Level

4 SD IN LEV Received SD Signal Level

5 TX APC V Transmitter LO APC Voltage

6 RX APC V Received LO APC Voltage

7 FET V Output Voltage of FET PS

8 LINE V Input Voltage of DC-DC CONV

9 PS V Output Voltage of DC-DC CONV

MTD-SY-013/120703 NEC Corporation, Tokyo, Japan

Documents

Sdh3000s Mtd